SWARNIMA BA07ARC018MAITREYI BA07ARC007

Earth Air Tunnel• The Earth Air Tunnel (EAT) systems utilizes the heat-storing capacity of

earth and the fact that the year round temperature four meter below the surface remains almost constant throughout the year. That makes it potentially useful in providing buildings with air-conditioning. Depending on the ambient temperature of the location, the EAT system can be used to provide both cooling during the summer and heating during winter.

• The tunnels would be especially useful for large buildings with ample surrounding ground. The EAT system can not be cost effective for small individual residential buildings.

• The ground temperature remains constant and air if pumped in appropriate amount that allows sufficient contact time for the heat transfer to the medium attains the same temperature as the ground temperature.

Variables of the Earth Air Tunnel:

• Length of the tunnel (Enough for air to lose heat to a certain extent)

• Depth of the tunnel• Material of the tunnel• Diameter of tunnel (due to inner surface area)• Temperature of air• Difference between ambient temperature and

earth temperature

•Earth Air Tunnels have been used successfully at TERI retreat at Gurgaon, Gul Pahari, Delhi, where the underground tunnels serve the living quarters. The living quarters are maintained at temperatures approximately between 20 to 300 C round the year.

• The system utilizes tunnel, air intake ports and dehumidification. The treated air is passed to the spaced through ducts and supply grills and are allowed to escape to the atmosphere after affecting the desired heat transfer in the space.